Merge #13954: Warn (don't fail!) on spelling errors. Fix typos reported by codespell.

f8a81f73ac lint: Add spell check linter (codespell) (practicalswift)
ada356208e Fix typos reported by codespell (practicalswift)

Pull request description:

  * Check for common misspellings using `codespell`.
  * Fix recently introduced typos reported by `codespell`.

Tree-SHA512: 9974c0e640b411c7d0ebc5b45de253c19bac7fe3002cd98601ff8da8db584224c2fd7d331aee3df612c9f2cfef540d647a9b4c5a1a73fd208dc93ce4bf9e5e3e

contrib/debian/copyright

@@ -96,7 +96,7 @@ Comment: Site: https://bitcointalk.org/?topic=1756.0
 Files: src/qt/res/icons/proxy.png
        src/qt/res/src/proxy.svg
 Copyright: Cristian Mircea Messel
-Licese: public-domain
+License: public-domain
 
 
 License: Expat

contrib/gitian-build.py

@@ -170,7 +170,7 @@ def main():
 
     args.sign_prog = 'true' if args.detach_sign else 'gpg --detach-sign'
 
-    # Set enviroment variable USE_LXC or USE_DOCKER, let gitian-builder know that we use lxc or docker
+    # Set environment variable USE_LXC or USE_DOCKER, let gitian-builder know that we use lxc or docker
     if args.docker:
         os.environ['USE_DOCKER'] = '1'
     elif not args.kvm: